01 - Whisk together the olive oil, lemon juice, garlic, oregano, paprika, salt, and pepper in a large bowl until well combined.
02 - Add the chicken pieces to the marinade, stirring to coat thoroughly. Cover and refrigerate for at least 20 minutes or up to 2 hours for enhanced flavor.
03 - Heat your grill to medium-high temperature, approximately 400°F.
04 - Thread the marinated chicken, bell peppers, onions, zucchini, and mushrooms onto skewers, alternating ingredients for even cooking and visual appeal.
05 - Lightly brush the assembled kabobs with any remaining marinade for extra flavor.
06 - Place kabobs on the grill and cook for 12-15 minutes, turning every 3-4 minutes, until chicken reaches an internal temperature of 165°F and vegetables are tender with light charring.
07 - Remove from grill and let rest for 2 minutes before serving. Garnish with chopped fresh parsley and lemon wedges if desired.